/Engine/Source/Runtime/GeometryCore/Public/DynamicMeshEditor.h
Fill hole with a triangle fan given an existing (unconnected) center vertex and an ordered loop of boundary vertices on the hole border.
true if operation succeeded. If a failure occurs, any added triangles are removed via RemoveTriangles.
bool AddTriangleFan_OrderedVertexLoop ( int CenterVertex, const [TArray](API\Runtime\Core\Containers\TArray)< int > & VertexLoop, int GroupID, [FDynamicMeshEditResult](API\Runtime\GeometryCore\FDynamicMeshEditResult) & ResultOut )